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Black rectangular 12-pin wiring harness connector with colour-coded wires attached

METRA

METRA 70-1677-1 GM 1973-1993 12-pin vehicle harness

SKU CH-DSCH-3M2AP MPN 70-1677-1

12-pin vehicle harness plugs into the factory radio connector on General Motors models from 1973 to 1993 for power and four-speaker connections

  • Product typeDash Installation Kits
  • Key featuresGeneral Motors 73-9312 pin wire harness that plugs into car
  • Plugs straight into the factory 12-pin radio connector
  • Covers GM vehicles from 1973 through 1993
  • Supplies power plus four speaker channels
  • Compatible with Metra 99-4700 dash kit (sold separately)

Vehicle Harness for GM 1973–1993

This 12-pin Metra harness plugs directly into the factory radio connector on General Motors vehicles built between 1973 and 1993. It carries power and four speaker channels so an aftermarket stereo can be installed without cutting the original wiring. The moulded connector matches the OEM layout for a secure fit. Installation is completed by crimping or soldering the leads to the new head unit harness.

Installers Replacing Factory Radios

The harness suits anyone fitting an aftermarket stereo into a compatible GM dashboard from the listed era. It does not support vehicles outside the 1973–1993 range or models that use a different pin count. Builders needing steering-wheel control retention, amplified-system integration or additional accessory circuits will require separate adapters. Dash kits and antenna adapters are also sold separately.

How it compares

Measured against everything we stock in Car Audio Accessories & Wiring, at today’s prices. Recalculated every night.

Price $1.99
Cheaper than about 99% of the 2,768 comparable items (median $21.99).

Specifications

Product
Brand nameMetra
Product typeDash Installation Kits
Size & build
Shipping weight0.45 kg
Package size127 × 102 × 51 mm

Questions about this item

Does the Metra 70-1677-1 harness include the dash kit or antenna adapter, or must they be purchased separately?

The dash kit (model 99-4700) and antenna adapters are sold separately; this package contains only the 12-pin GM harness.

Is the 70-1677-1 the correct harness for a 1973-1993 GM vehicle with a 12-pin radio connector?

Yes, it is designed for GM vehicles from 1973 to 1993 using a 12-pin factory radio plug for power and four speakers.

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